<ul style="padding:0 5px;background: rgb(228, 196, 215)">
  <li routerLink="oneChild1" routerLinkActive="activeChild">oneChild1</li>
  <li routerLink="oneChild2" routerLinkActive="activeChild">oneChild2</li>
  <li routerLink="oneChild3" routerLinkActive="activeChild">oneChild3</li>
  <li routerLink="oneChild4" routerLinkActive="activeChild">oneChild4</li>
  <li style="color:red;font-size:20px;">由子组件one-child2控制父组件属性，跳转到one-child2开始执行interval：
    <span style="color:blue;">{{childInterval}}</span>
  </li>
</ul>
<router-outlet></router-outlet>


